Check the listing for details. Southwest Wheel 7,000 lbs. Trailer Axle Self Adjusting Electric Brake Kit 9/16". Condition: New. Listed at 350.99 USD. 8-6.5" Bolt Circle 7,000 lbs. Trailer Axle Self-Adjusting Electric Brake Kit 9/16" Studs Pair of 12" 9/16" Studs hub/drum 8 studs 6.5" bolt circle using L25580 inner and 14125A outer bearing. Contains inner bearings, outer bearings, grease seals, grease caps, ultra lube grease caps, spindle washers, spindle nuts, cotter pins, tang washers, and lug nuts. (42 Spindle) Pair of 12" x 2" self-adjusting electric trailer brake assemblies with parts. 5 Hole Mounting. For Alko, Dexter, Quality, or other popular trailer axle manufacturers. Only works on 7,000 lbs trailer axles with five hole brake flange. Includes mounting hardware. These are fully assembled backing plates with shoes, springs, and magnets attached and ready to be mounted. The pair includes one left hand and one right hand brake assembly.